JP2003118777A - Food packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a food packaging bag which prevents not only ultraviolet rays but also visible rays from transmitting to prevent degradation of contents. SOLUTION: The food packaging bag comprises, as a constituent material, a packaging film with a multi-layered printed layer printed by two or more kinds of ink including at least silver ink. The packaging film has at least an external layer and an oxygen barrier layer, and also has the multi-layered printed layer comprising a first white printed layer, then a second silver printed layer, and a third white printed layer with or without Indian ink, red and yellow and disposed if necessary. Amounts of applied white ink and silver ink are respectively 1.5 to 4.0 g/m<2> , their brightness is 60% or higher, and beam transmittance is 5% or less with a wavelength of 390 nm or less, 10% with a wavelength of 450 nm or less, 15% or less with a wavelength of 600 nm or less, and 20% or less with a wavelength of 700 nm or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouch for preventing deterioration of inclusions. More specifically, it relates to a pouch suitable for preventing deterioration of food such as curry roux, pasta sauce, stew, Chinese side dishes such as Chinese rice bowls, and various beverages.

[0002]

2. Description of the Related Art Conventionally, various liquid packaging containers for storing various products such as foods and drinks, liquid detergents, etc. have been proposed, and as the liquid packaging container, a paper pack, a standing pouch, etc. are available. Are known. However, in the above liquid packaging container, there is a problem that the inclusions undergo photodegradation such as fading during long-term storage. Therefore, as a liquid packaging container for preventing the optical deterioration of the inclusions, there has been proposed a container in which the inner surface of the container is formed of a metal layer such as an aluminum foil. The container using this metal foil has the effect of completely blocking the permeation of oxygen, but it is difficult to separate the metal layer from the other layers, and it is difficult to incinerate, which is not preferable in terms of environmental problems, etc. . Therefore, it has been proposed to use a plastic film having a metal oxide vapor deposition layer such as an aluminum oxide vapor deposition layer. The aluminum oxide vapor-deposited layer is a thin film with a maximum thickness of 800 angstroms or less and is also transparent, and is treated in the same manner as a printing ink, and it does not require separate incineration and no environmental problems occur. However, oxygen transmission cannot be completely prevented, and a small amount of oxygen invades. Further, as a liquid packaging container having a light-shielding property without having a metal foil layer such as aluminum foil, a liquid having a light-shielding laminated structure of paper / direct color layer / paper is disclosed in Japanese Utility Model Publication No. 5-5445. A paper container has been proposed, but in the liquid paper container, it is particularly necessary to provide a light blocking layer made of a synthetic resin, and it is difficult to separate the light blocking layer from the paper, so that recycling is possible. Is difficult and has environmental problems. Further, Japanese Patent No. 3017399 discloses a container formed of a sheet in which a gray ink layer having a hue of 5B to 5P, a saturation of 0, and a brightness of 6 to 7 is provided on the outer surface of a resin sheet. However, in such a container provided with a gray ink layer, the content of the contents looks like a black and dirty color, which gives an unpleasant sensation and thus has a problem of deteriorating the commercial value. The applicant of the present application discloses, as Japanese Patent Application No. 2001-235563, a pouch comprising an oxygen barrier plastic film of at least one layer, a white ink layer formed on the entire surface, and a laminate film including a light-shielding layer. The light-shielding layer contains 0.5 to 6.0% by weight of black ink, 0.5 to 6.0% by weight of crimson and / or yellow, and the balance white ink, and a hue according to the Munsell system containing other colors as desired. Is 5.5P to 5.0GY and the saturation is 0.2 to 5.
A barrier pouch having a value of 0 was filed, but the present invention is an invention in which the transmission of visible light is further improved.

[0003]

DISCLOSURE OF THE INVENTION According to the present invention, a food contained in a container made of a plastic film is deteriorated not only by ultraviolet rays but also by visible rays, and deterioration due to visible rays is caused by a synergistic effect with invading oxygen. Deterioration progresses.
Since the transmission of visible light cannot be completely suppressed even when white ink is used, a food packaging bag in which the transmission of visible light is prevented by using silver ink is provided.

[0004]

Means for Solving the Problems The present invention provides a food packaging bag comprising a packaging film having a multilayer printing layer printed with two or more inks containing at least a silver ink as a constituent material. Has at least an outer surface layer and an oxygen barrier layer, and has a white first printing layer,
Next, a second printing layer of silver color is arranged, and then, a third printing layer of white color with or without addition of black ink, crimson, and yellow is arranged as necessary, and a multi-layered printing layer is provided. The coating amount of each is 1.5 to 4.0 g / m ² , and the brightness is 60.
% Or more, the light transmittance is 5% or less at a wavelength of 390 nm or less, 45
A food packaging bag characterized by 0 nm 10% or less, 600 nm 15% or less, and 700 nm 20% or less. 2. 1 selected from EVOH film, metal evaporated PET film, metal evaporated nylon film, polyvinylidene chloride film, polyvinylidene chloride coat film and MX nylon film as the oxygen barrier layer of the packaging film.
Alternatively, the food packaging bag according to item 1, which has two or more components. 3. The food packaging bag according to item 1 or 2, which has an oxygen permeability of 40 cc / m ² day or less. 4. The food packaging bag according to any one of items 1 to 3, wherein a design ink is arranged between the first printing layer of the packaging film and the film. 5. Item 5. The food packaging bag according to any one of Items 1 to 4, wherein an intermediate layer is disposed next to the white third printed layer, and then an inner layer is disposed. Regarding

[0005]

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a first printed layer of a white ink layer on one side of a substrate film containing at least an oxygen barrier layer, then a second printed layer of silver ink, and then the second printed layer. A packaging film provided with a third printing layer with or without addition of black, crimson, and yellow as needed is used. Pouches made of plastic film have been widely used since they can easily see the contents inside when food is included, which attracts consumers' attention and increases the commercial value.
When oxygen permeates the film, the inclusions are altered, so an oxygen barrier film is used to minimize the passage of oxygen.

As the oxygen barrier plastic film, a film provided with a metal oxide vapor deposition layer such as an aluminum oxide vapor deposition film is preferable. The ethylene-vinyl alcohol copolymer is widely used for the oxygen barrier layer, but since the water resistance during retort deteriorates poorly, the oxygen barrier layer is not preferable for the pouch used for the retort. A metal oxide vapor-deposited layer such as a layer is also preferable in terms of environmental resistance. In addition, polyvinylidene chloride film, polyvinylidene chloride coat film, MX nylon film and the like are also used.

As the metal oxide vapor deposition layer, a silicon oxide vapor deposition layer other than an aluminum oxide vapor deposition layer may be used. However, SiO ₂ deposited film has no oxygen barrier property, SiO _x is SiO deposited film has excellent oxygen barrier properties, are unstable, and since the appearance becomes tan deteriorates, the SiO and SiO ₂ are blended , X = 1.7 to 1.8, a preferable effect is obtained. Further, a good effect can be obtained by forming a silicon oxide layer on the aluminum oxide vapor deposition film to protect the aluminum oxide vapor deposition film. However, if a metal oxide vapor deposition layer is used, even if the amount of oxygen permeation can be reduced, some oxygen intrusion occurs. Further, the inclusions are deteriorated by the light passing through the film, but according to the research by the present inventor, the deterioration due to light and the deterioration due to oxygen have a synergistic effect, and therefore the deterioration cannot be prevented unless the passage of light is prevented. Moreover, the photodegradation occurs not only in the ultraviolet region but also in the visible wavelength region. In order to prevent the transmission of ultraviolet light, the plastic film forming the pouch can be cut almost completely by coloring it in white, but the visible light cannot be cut completely. On the other hand, if a black or gray colored layer is arranged, it is possible to prevent the transmission of visible light, but if such a color is added, the food and drink contained in the pouch will look dark and dirty, and it will be unpleasant. Because it gives an impression, the product value is significantly impaired.

Next to the white ink printing layer of the present invention,
Place the printing layer. Visible light is not visible only with the white ink layer
Since it cannot be completely cut, a silver ink layer is placed and visible
It highly suppresses the transmission of light rays. White ink and silver
The amount of color ink applied is 1.5 to 4.0 g / m, respectively.²To
As a result, the light transmittance of 390 nm or less is 5% or less and 450 nm is
10% or less, 600 nm 15% or less, 700 nm 20% or less,
Deterioration of contents is prevented by setting brightness to 60% or more
The change in taste prevents browning, discoloration, and odor generation.
is there. Since silver ink, white ink and cohesive failure are easy to occur,
When used in combination with film or other ink
In some cases, the adaptability may be poor, but as in the present invention, silver
Color ink and white ink are combined, and the amount of each ink is applied.
1.5-4.0 g / m ²And a brightness of 60% or more is suitable.
The compatibility is good and the silver ink layer is not broken.

The base film of the packaging film provided with the multilayer printing layer used in the food packaging bag of the present invention is an EVOH film, a metal vapor-deposited PET film, a metal vapor-deposited nylon film, a polyvinylidene chloride film, a polyvinylidene chloride film, MX. It has one or more oxygen barrier layers selected from nylon films. The food packaging bag of the present invention has an oxygen permeation amount of 40 cc / m ² day or less. If the amount of oxygen permeation is larger than this, the contents will deteriorate even if the transmission of light is prevented. In the present invention, black, red, and yellow are added to the white ink of the third printing layer, which is provided as necessary, in order to bring the contents closer to the color of the contents and prevent the contents from looking dirty from the outside of the container. Is. The color can be appropriately selected depending on the contents.

A design ink layer may be disposed between the packaging film and the first printing layer of the white ink to improve the aesthetics and enhance the commercial value. As the outer surface layer of the packaging film used in the present invention, a PET film, a nylon film or a polypropylene film is used. However, since the PET film has good bag-making property, printability and gloss, it is preferable to use it on the outer surface side. Impact resistance is improved by using nylon film as the intermediate layer. The inner surface layer is preferably an olefin film such as polyethylene or polypropylene from the viewpoint of heat sealability.

FIG. 1 shows a cross section of a packaging film provided with a multi-layered printing layer for use in the food packaging bag of the present invention, wherein 1 is a base film layer and 2 is an oxygen barrier layer. Reference numeral 3 is a first printed layer of white ink, 4 is a second printed layer of silver ink, and 5 is a third printed layer of white ink provided as necessary. 6 is an intermediate layer, and 7 is an inner surface layer.

[0012]

EXAMPLES Next, specific examples will be described. Example 1 As a base film, aluminum oxide with a thickness of 12 μm
White ink 1st mark on the vapor-deposited surface of PET film layer
Printing layer, coating amount 2.5 g / m² , As the second printing layer, Toyo
Ink Manufacturing Co., Ltd. New LP Super colored silver 100% silver
Ink layer, coating amount 2.5 g / m², Further on the silver ink layer
, White ink third printing layer, coating amount 2.5 g / m² The gravure
It was provided by printing. Print this pre-printed base film
A urethane adhesive is used for the layer surface,
Axial stretched nylon film is dry laminated, and
A nylon film with a 70 μm-thick polypropylene film
Dry laminated, the layer structure is vapor-deposited PET / white
1st printing layer / silver ink 2nd printing layer / white ink 3rd mark
Printing layer / biaxially oriented nylon / polypropylene packaging film
It was created. A four-sided sheet formed using this packaging film
Heat the orange bag filled with tangerine juice (100% fruit juice)
It was sealed to form a package. Irradiate this package with a fluorescent lamp
Stored at 22 ° C / 60% relative humidity for 3 months
Existed. The printing ink composition and coating amount are shown in Table 1, performance test
The results are shown in Table 2.

Example 2 A packaging body similar to that of Example 1 was prepared except that the white ink third printing layer was not provided in the packaging film of Example 1. The printing ink composition and coating amount are shown in Table 1, and the results of the performance test are shown in Table 2.

Examples 3 to 8 and Comparative Examples 1 to 3 The packaging film was the same as that of Example 1 except that the printing ink and the ink application amount were as shown in Table 1. Using this packaging film, a performance test was conducted in the same manner as in Example 1. The results are shown in Table 2.

[0015]

[Table 1]

[0016]

[Table 2]

(Note) 1. Comparative Example 1: Since the colored silver ink directly adheres to the substrate film, the suitability for lamination and the ink adhesion are poor. 2. Comparative Example 2: Since the coating amount of the colored silver ink is not small, the visible light portion has a high transmittance. 3. Comparative Example 3: Since there is no colored silver ink layer, the visible light portion has a large transmittance,
The contents had browning, off-taste, and off-flavor. Also, since the amount of ink applied is large, the ink adhesion is poor. 4. In the table, ○ and × are as follows. 4. Browning, fading: ○ (absent), × (absent) Taste / taste: ○ (no change), × (offering offensive odor) Ink adhesion: ○ (good), × (poor) 5. Measurement method (1) Oxygen permeability Oxygen permeability measuring device OX-TRAN2 / 20 (MOD
Measured by ERN CONTROL). Measurement conditions: 22 ° C.-60% RH (2) Light transmittance JASCO Corporation UV / VIS / NIR Spectrop
390nm, 4 using photometer V-570
The light transmittance was measured for light having wavelengths of 50 nm, 600 nm and 700 nm. (3) Lightness L value The printing surface was attached to white Kent paper with the ink side as the measurement side, and measured using a Nippon Denshoku NFf999 spectral color difference meter (2 degree visual field, C light source). (4) Ink Adhesiveness After retort treatment at 120 ° C. for 30 minutes, the appearance state was visually confirmed, and delamination or the like was observed. 6. Inclusion Tangerine juice (100% fruit juice)

[0018]

INDUSTRIAL APPLICABILITY The present invention has an excellent effect of preventing deterioration of contents due to light and oxygen by sufficiently cutting visible light.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a packaging film that constitutes a food packaging bag of the present invention.

[Explanation of symbols]

1 PET film 2 Aluminum oxide vapor deposition layer 3 White ink first printing layer 4 Silver ink second printing layer 5 White ink third printing layer 6 Middle class 7 Inner layer

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) B65D 65/16 B65D 65/16 65/40 65/40 D 65/42 65/42 A (72) Inventor Yoshiaki Otsuka Tokyo 1-3-1 Uchisaiwaicho, Chiyoda-ku, Toyo Seikan Co., Ltd. F term (reference) 3E064 BA29 BA36 BA38 BA55 BB03 BC08 BC14 BC18 BC20 EA18 HA06 HN05 3E067 AA04 AA11 AB01 BA12A BB14A BB25A BB26A CA06 CA12 FA01 FC01 AB01 GD01 AD01 3 BA15 BA24 BB05 BB22 BB62 CA01 4F100 AA19 AB01C AB24D AK01C AK01D AK07 AK16C AK42C AK42D AK46C AK48C AK48D AK69C AT00B BA03 BA04 BA05 BA07 BA10B00D J10B00D J10B00B00B01B16B00B00B00B00B16B16B16B16E E66

Claims (5)

[Claims] 1. A food packaging bag comprising a packaging film provided with a multilayer printing layer printed with two or more inks containing at least silver ink, the packaging film having at least an outer surface layer and an oxygen barrier layer. , And a white first printing layer, then a silver second printing layer, and then a white third printing layer with or without addition of black, crimson, and yellow as needed, and a multilayer printing layer. The coating amount of white ink and silver ink is 1.5 to 4.0 g / m ² , the lightness is 60% or more, and the light transmittance is 5% or less at wavelength 390 nm or less, 450 nm10 %, 600 nm 15% or less, 700 nm 20% or less, a food packaging bag. 2. An EV as an oxygen barrier layer of a packaging film.
The food packaging according to claim 1, which comprises one or more selected from an OH film, a metal-deposited PET film, a metal-deposited nylon film, a polyvinylidene chloride film, a polyvinylidene chloride coat film, and an MX nylon film. bag. 3. The food packaging bag according to claim 1, which has an oxygen permeability of 40 cc / m ² day or less. 4. The food packaging bag according to any one of claims 1 to 3, wherein a design ink is arranged between the first printing layer of the packaging film and the film. 5. The food packaging bag according to any one of claims 1 to 4, wherein an intermediate layer is disposed next to the white third printed layer, and then an inner layer is disposed.